Feed-water-heating system for multiple-expansion engines.



B. V. NORDBERG. FEED WATER HEATING SYSTEM FOR MULTIPLE EXPANSIONENGINES.

APPLIOATION FILED FEB.4, 1907. 1,034,026. Patented July 30, 1912.

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B. V. NORDBERG. FEED WATER HEATING SYSTEM EOE MULTIPLE EXPANSIONENGINES. APPLICATION FILED FEBA, 1907.

1,034,026, Patented July 30,1912.

2 SHEETS-SHEET 2.

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BRUNO V. NORDBERG, OEMILWAUKEE, WISCONSIN.

FEED-WATER-HEATING SYSTEM FQR MULTIPLE-EXPANSION ENGINES.

Specification of Letters'latent.

Patented July 30, 1912.

Application filed February 4, 1907. Serial No. 355,658.

To all whom it may concern:

Be it known that I, BRUNO V. NORDBERG, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements in Feed- Water-Heating Systems for Multiple- Expansion Engines, of which thefollowing 1s a specification.

The present invention pertains to 1mprovements in feed water heatingsystems for multiple expansion engines, the construction and advantagesof which will be hereinafter fully set forth, reference being had to theaccompanying drawings, where- In Figure 1 the system is diagrammaticallyillustrated and in Fig. 2 a modification of the invention is shown.

The main object of the invention is to provide a feed-water heatingsystem wherein the exhaust steam from each cylinder of the engine orseries of engines is employed to heat the feed-water, the steam bypreference, after it passes through each feed-water heater beingreheated before it enters the next cylinder of engine, whereby theefliciency of the engine is greatly increased.

A further object of the invention is to secure such reheating of thesteam by the gases vor products of" combustion passing from the steamgenerator and to cause the steam to pass through the reheater in adirection reverse or counter to that of the passage of the gasestherethrough, whereby the steam consumption will be reduced and asa'consequence a smaller amount of-fuel will be required.

A still further object of the invention is to provide means forarresting and withdrawing, to a greater or less extent, the oil or otherlubricant which'passesfrom the engine cylinders with the exhaust steam,

thus preventing such lubricant from passing manner as to cause saidwater of condensa tion to impart its heat to the feed-water lee-- foresaid feed-water passes into the upper part of the heater where the steamserves as a heating medium.

With the apparatus hereinafter set forthtions K mountedin the reheater.

said to be an improvement on the system shown in Letters Patent 728,282,granted to me under date of May 19, 1903. The pres ent invention differsfrom the system therein shown in that in the present case the steamafter passing from the high and interme-- diate cylinders and throughthe feed-water a heaters, is itself reheated before passing to the nextcylinder or engine in the series.

Provision is also made for causing that port-ion of the exhaust steamwhich condenses to pass through heating coils or ducts located in thepath of travel of the feed-water,

.whereby the heat units of such condensed steam will be fully utilized.At the same from the cylinders through the heaters with the feed-water.

Referring tothe drawing, A, B, C denote the cylinders of a multipleexpansion en-' gine, A being'the high-pressure cylinder, C thelowpressure cylinder, and B the intermediate cylinder. In so far as thegeneric invention is concerned, it will be evident that two or morecylinders may be used or compounded as desired. 9

Steam passes to the high-pressure cylinder from the generator D througha pipe E and is exhausted-from thehigh-pressure cylinder through a pipeF, into the receiver or steam chamber G formed in the upper portionofthe heater H. From said chamber G it passes through apipe into areheater J said pipe entering the reheater at the end remotefrom theboiler or generator, so that the steam will pass in the directionindicated by the arrows, such circuitous passage being affected by thediaphragms or parti- The reheated steam passesthrou'gha pipe L to theintermediate. cylinder B, being discharged therefromthrough a p'ipeMinto a chamber G formd in-the upper portion of the feedwater heater H.From said chamber it the steam to take a circuitous or tortuous paththrough said reheater to the pipe Q which is located at the end of thereheater nearest to the furnace or generator. As will be noted uponreference to the drawing, the reheatersJ and 0 have a series of pipes ortubes B, through which the smoke and products of combustion from thefurnace pass on their way to the stack. The steam reheated in the secondreheater passes through pipe Q to the low-pressure cylinder C, throughpipe S to the chamber or receiver G formed 1n the reheater H The steamfrom said chamber G passes to a condenser T, the water of condensationbeing exhausted from said condenser by an airpump U.

The feed-water for the boiler is forced through the system by a pump V,passing from the pump through a pipe \V into a chamber X formed in thelower portion of the heater H. It then passes through tubes Y whichcommunicate with the chamber X and a chamber Z formed in the upperportion of the heater H From said chamber Z it passes through a pipe 1;into a chamber 6 formed in the lower ortion of the heater H. Saidchamber 7) 1s in-communication with a chamber 0 located at the up er endof the heater H,'through pipes d which pass through the chamber'G. Thechamber a discharges into a pipe 6 which communicates with a chamber fformed in the lower portion of the heater H. Said chamber f communicateswith a chamber 9 through tubes or pipes h which pass through the chamberG. The water entering chamber 9' is fed into the boiler through a pipe6.

The steam passing from exhaust pipe F will to a greater or less extentcondense in the chamber G, and to withdraw said water of condensationand utilize it in heating the feed-water a pipe 7' opens out from thelower end of the chamber G and is connected with a series of coils klocated in the chamber f. Said coils are connected to a pipe Z whichdischarges into a valve-casing or chamber m, in which is placed a floatvalve or trap 11. The valve-chamber is connected with a ipe 0 whichopens into the lower ortion o the chamber G. A pipe 1) opens into thelower .end of the chamber G nd is connected with a series of coils is,located in the chamber 6', such coils at e lower end being connected byapipe Z, with a valve-box or chamber m, in which islocated a float valveor trap a. The lower portion of said valve-box or chamber is incommunication with the lower part of the chamber G through a pipe g.

The 0 eration of the a paratus thus described 1s as follows: T e exhauststeam passing from the cylinder A acts upon the feed-water flowingthrough tubes or pipes h and thence passes through the pipe I to thereheater J, which is located nearest or adjacent to the boiler. It thenpasses through the pipe Lto the cylinderB where it acts expansively," isexhausted through pipe M into the second heater H, and circulates aroundthe pipes 01, serving to impart a portion of its heat to the feed-waterflowing through said pipes. From heater H the steam passes through pipeN to the reheater O and from said reheater through the pipe Q to thelowpressure cylinder C. The exhaust steam from said cylinder passesthrough the pipe S into the chamber G and around the pipes Y therein,imparting the greater portion of its heat to the feed-water flowingthrough said pipes. It then passes to the condenser T, from which thewater of condensation is withdrawn by the air-pump U. As before noted, aportion of the steam which passes from the cylinder A into the chamber Gwill be condensed and a certain amount of lubricant or oil will likewiseenter said chamber G with the steam. The pipe j will tend to drain thiswater of condensation and the oil from said chamber, the pipedischarging into the coils 7:, and the oil and water flowingtherethrough in a direction reverse to the flow of the feed-waterthrough the chamber f. The water and oil passing through the pipe 1 willflow through the valve-box or chamber m,and through the pipe 0 so longas there is suflicient water in the valve-box to hold the valve 11 oifits seat. The water entering chamber G will commingle with the water ofcondensation formed in said chamber by the steam passing through pipe M,and will'fiow with such additional water of condensation through pipe 1)and coils k, the direction of travel, as in the former case, being thereverse of that ofthe feed-water through the chamber 1). From the coilsk the water will pass through the pipe Z, valve-box or chamber m, pipeg, and into the lower portion of the chamber G From said chamber itpasses to the condenser T. V

Inasmuch as the pressure of the steam in the chamber G will be higherthan that in the chamber G and the pressure of the steam in thelatterhigher than that in the chamber G itis necessary to employ thevalves n and n to prevent the steam from blowing through the pipes whenno water is present therein. The water passing from the airpump may beallowed to' go to waste, or purified and again used as feed-water. Thesteam which passes from the feed-water heaters G and G will be quitewet, but by the employment of the reheaters J and the steam passing tothe cylinders B and C will be comparatively dry and, therefore, highlyefficient. By connecting the coils k and k in the manner set forth thefeedwater while in its coldest condition enters either of the chambersbor f and comes -steam located between the heater through which theexhaust steam contact with the coils which are the coolest, and as thewater flows upwardly it is gradually warmed and .comesin contactwithithe coils which are the hottest. It isevident that under theseconditions the greatest possible exchange of heat between the water ofcondensation and the feed-water takes place; The water leaving the coilsk is cooled to approximately the sametemperature as the feed waterpassing into the chamber f-through the pipe 0, or to approximately thetemperature of the steam in the exhaust pipe M. The same relation existsbetween the temperatures in the coils 7c and the feed-water which passesinto the chamber b through pipe a. In practice the water of condensationpassing from the pipe 0 into the chamber G will be a little hotter thanthe water of condensation from the pipe M, and as a consequence a partof the water will be evaporated As the pressure in the chamber G isconsiderably less than that inthe chamber Gwhatever steam may be formedin this manner will, of course, pass through the superheater and thus beutilized.

It may,under certain conditions,be profitable to pass the water ofcondensation from the pipe (I through a separate heater for thefeed-water, constructed in a manner similar to the heating chambers Z2and Such construction is shown in Fig. 2. In this case the supplementalheater 1) would have to be placed between the heater II and the chamberb, as the temperature to which the water would be heated in saidsupplemental heater would probably be higher than that at which thefeed-water would leave the heater H No claim is made herein to afeed-water heating system comprising the combination of the feed-waterheater into which the exhaust from the engine cylinder passes, and

- means for causing the water of condensation to primarily heat the feedwater, such matter being reserved for a separate appli cation filed as adivision hereof.

Having thus described my invention, what I claim is:

1. In a feed-water heating system for multiple expansion engines, thecombination of a plurality of engine cylinders; a feed-water heaterthrough which the exhaust steam from the high-pressure cylinder passes;and a reheater for such exhaust feed-water heater and the low-pressurecylinder.

2. In a feed-water heating system for multiple expansion engines, thecombination of a plurality of engine cylinders; a feed-Water from thehigh-pressure cylinder passes; a reheater forsuch exhaust steam locatedbetween the feed-water heater and the lowpressure cylinder; and a steamgenerator,

.multiple expansion engines, the combination steam inlet-s of the secondand third engine cylinders.

4:. In a feed-water heating system for of a water-heater having a steamspace into which the high-pressure cylinder exhausts; a pipe or ductextending from the lower portion of the steam space and passing throughthe water in the lower part of the heater; means for introducing waterinto the lower end of the heater and drawing it from the upper port-ionthereof; and means for reheating the steam as it passes from thewater-heater to the next cylinder in series.

5. In a feed-water heating system for mul- ,tiple expansion engines, thecombination of a plurality of engine cylinders; a feed-water heater foreach engine into which it exhausts; means for utilizing the water ofcondensation of such exhaust steam to primarily heat thewater in thewater heater;

and means for reheating the steam as it passes from the water heater tothe next cylinder in the series.

6. In a feed-water heating system for mult-iple' expansion engines, thecombination of a. plurality of engine cylinders; a feed-water heater foreach engine into which it exhausts; a pipe communicating with the lowerportion of the steam space in the first heater of the series, said pipepassing through the water space in the heater and communicating with thesteam space of the next heat-er; a similar pipe connecting the steamspace of said second heater with the steam space of the third heater;and means for reheating the steam as it passes from the water-heater tothe next cylinder in series.

7. In a feed-water heating system for multiple expansion engines, thecombination of a plurality of engine cylinders; a feed-water heaterconnected with the exhaust of each of said cylinders; a pipe extendingfrom the steam space of the heater through the water space .in theheater, and to the steam space of the next adjacent heater; a similarpipe connecting the second and third heaters; a check-valve located ineach of said pipes; and means for reheating the steam as it passes fromthe Water-heater to the next cylinder in series.

8. In a feed-water heating system for multiple expansion engines, thecombination of a plurality of engine cylinders; a waterheater connectedto the exhaust of each of said cylinders; a pipe extending from thesteam space of the first heater through the Water space in the heaterand to the steam space of the next adjacent heater; a similarly arrangedpipe connecting the second heater with the third/heater; and means forreheating the steam passing to the low-pressure cylinders.

9. In a teed-water heating system for multiple expansion engines, thecombination with a series of engine-cylinders and their steam supply andexhaust connection; of a feed-Water heater supplied with steam from thelow-pressure cylinder and adapted to raise the temperature of thefeed-water to approximately that of the steam from the exhaust of saidcylinder; which said feed water passes on its way to the boiler, havingconnection With the steamspace of the engine and adapted tofurther raisethe temperature of the feed-water to approximately that of the steam atthe point from which tioned heater; and means forfreheating the steamafter it passes through said last a heater through i it is diverted tosaid last-m'ennamed heater and before it passes into the low-pressurecylinder.

10. In a feed-water heating system for multiple expansion engines, thecombination with a series of engine cylinders, their steam and exhaustconnections, and a condenser connected with the exhaust of thelow-pressure cylinder; of a heater located in the exhaust connectionbetween said condenser and cylinder; a pump arranged to force Waterthrough said heater; one or more heaters through which the feed-waterpasses on its Way to the boiler from the first-named heater, each ofsaid last-mentioned heaters being located between the exhaust of onecylinder and the supply of the next cyllnder' passes from saidlast-mentioned heaters and before it passes into the low-pressure andintermediate cylinders.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

BRUNO V. NORDBERG. Witnesses:

'E. C. BAYERLEIN, v E. W. LAWONN.

and means for reheating the steam as it x

